added pt payment

src/Faker/Provider/pt_PT/Payment.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Faker\Provider\pt_PT;
+
+class Payment extends \Faker\Provider\Payment
+{
+    /**
+     * International Bank Account Number (IBAN)
+     * @link http://en.wikipedia.org/wiki/International_Bank_Account_Number
+     * @param  string  $prefix      for generating bank account number of a specific bank
+     * @param  string  $countryCode ISO 3166-1 alpha-2 country code
+     * @param  integer $length      total length without country code and 2 check digits
+     * @return string
+     */
+    public static function bankAccountNumber($prefix = '', $countryCode = 'PT', $length = null)
+    {
+        return static::iban($countryCode, $prefix, $length);
+    }
+}